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Net-Centric Computing Overview

Net-Centric Computing Overview. 2110472 Computer Networks Natawut Nupairoj, Ph.D. Department of Computer Engineering Chulalongkorn University. “ Network is Computer .” -- Sun Microsystems. What is Net-Centric Computing ?. Applications on distributed environments ?

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Net-Centric Computing Overview

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  1. Net-Centric ComputingOverview 2110472 Computer Networks Natawut Nupairoj, Ph.D. Department of Computer Engineering Chulalongkorn University

  2. “Network is Computer.” -- Sun Microsystems. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  3. What is Net-Centric Computing ? • Applications on distributed environments ? • more than one machine / one user. • multiple platform is possible. • How can we exchange data ? • standard data formats. “Distributed environments where applications and data are exchanged among peers across a network on as as-needed basis.” Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  4. What is Net-Centric Computing ? • Are you my peers ? • security issues. • How soon is as-needed ? • Real-time / batch data exchanging. • Push / Pull. “Distributed environments where applications and data are exchanged among peers across a network on as as-needed basis.” Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  5. What is NCC, really ? • Information system (applications). • Multiple machines. • Over the network. • Seamlessly integrated. • Using standard data formats. • There are some securities. • Example, anyone ? Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  6. Why NCC ? • Stand alone system is not enough • Do you know “Starcraft” ? • Collaborative among users • All works are workflows by nature. • Pool of resources • Share disks, tapes backup, printers. • Centralized management • Application codes. • Data consistencies. • And much more… Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  7. What will be taught in this class ? • Network application architectures and services • A touch on “here-and-there”. • Application-level protocols. • Network-level protocols (TCP/IP) – very minimal. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  8. What will NOT be taught in this class ? • How to write a Java (or other languages) program. • How to create a web page. • How to write a network game • You should study Distributed System. • Low-level protocols (e.g. physical layer). Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  9. What should you know to enjoy this class ? • Use Internet for studying a lot • Search engine. • Programming. • HTML. • Database skills. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  10. The Revolution of NCC • “Tier”-based paradigms • Where the codes (or logics) are ? • Presentation / Business / Data logics. • Types of NCC architectures • One-tier. • Client/server (two-tier). • Three-tier. • Multi-tier. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  11. Single-Tier Architecture • Mainframe with “dumb” terminals. • Pros: • Good security and management. • Cons: • Difficult to improve. • Vendor “locked-in”. Data Business Presentation Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  12. Client/Server Architecture • Database server with fat clients (PCs). • Pros: • Cheap and simple. • Cons: • Difficult to manage. • Performance. • Security problems. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  13. Three-Tier Architecture • Database + Web server with Browsers (Thin clients). B • Pros: • Cheap and simple. • Good performance. • Simple to manage with good security. • Cons: • Slightly difficult to develop. DB Svr Web Svr B B Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  14. Multi-Tier – The Current Trends • Database + App + Web server with Browsers. B • Pros: • More flexible. • Cons: • More expensive. App Svr DB Svr Web Svr App Svr B App Svr B Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  15. Basic Terminologies • Internet • Anyone don’t know ? • Intranet • Very important. • Internal applications. • Extranet • Integrating with external parties. • VPN. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  16. E-everything – Buzz Words • E-Commerce. • E-Business. • E-Service. • E-Learning. • E-Billing. • E-Government. • EAI (Enterprise Application Integration). Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  17. A-2-Z • From who To who. • B2C. • B2B. • B2E. • G2G. • B2G. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  18. Content Delivery • Client “Pull” • Requested by client to get information. • Usually imply manual control. • “Smart pull”. • Server “Push” • Subscribe (or register) and update. • Utilize better network bandwidth. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  19. Net-Centric Services • Locator Services • Naming service (DNS). • Directory service (LDAP). • Data Repository Services • User profiles (Database). • Security Services • Authentication service (Login). • And more … Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  20. Summary • NCC Architectures. • Basic Terminologies. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

  21. References • S. Tilley et al., “The State of Net-Centric Computing in Early 2001”, The Proceeding of the 3rd International Workshop in Net-Centric Computing, May 2001, pp. 57-61. • S. Tilley, “The Era of Net-Centric Computing”, SEI Interactive, Vol.1, No.1, June 1998. • R. Peacock, “Distributed Architecture Technologies”, IEEE IT Professional, May/June 2000, pp. 58-60. Net-Centric Computing Overview Natawut Nupairoj, Ph.D.

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